Ingredients: 150gr all-purpose flour, 50gr potato starch, 180gr brown sugar, 75gr cocoa powder, 16gr baking powder, 400ml (400gr) skim milk, 250gr cold unsalted butter, 397gr (1 can) condensed milk. Calories (per serving): 410 Directions:In a bowl, sift all the dry ingredients (flour, potato starch, sugar, cocoa and baking powder). Gradually add the milk until you reach a thin, even mixture. Pour the batter in a 22-24cm cake mold and bake at 160°(320 F) for approx. 50 minutes (the cake has to be dry on the outside but moist on the inside). Let the cake cool completely before unmolding it. To prepare the filling, beat the butter with electric whisks at maximum speed for at least 10 minutes, until the butter looks fluffy and light. Add the condensed milk and keep beating for 10 more minutes. Slice the cake and fill it with the butter filling, then store in the fridge untill 20 minutes before serving. For a more detailed translation, use the Translator in the side bar